www.mercury-security.

com
2355 MIRA MAR AVE. LONG BEACH, CA 90815-1755, (562)986-9105 FAX (562) 986-9205

This device complies with part 15 of the FCC Rules. Operation

LP1502 Intelligent Controller is subject to the following two conditions: (1) This device may
with Two Reader Interfaces not cause harmful interference, and (2) this device must
accept any interference received, including interference that
may cause undesired operation.
Installation and Specifications:

1. General:
The LP1502 intelligent controller provides decision making, event reporting, and database storage for the
Mercury hardware platform. Two reader interfaces provide control for two physical barriers.
The LP1502 communicates with the host via on-board 10-BaseT/100Base-TX Ethernet port or the Micro
USB port (2.0) with an optional Micro USB to Ethernet adapter.
Each reader port can accommodate a reader that utilizes TTL (D1/D0, Clock/Data), F/2F (standard or
supervised) or 2-wire RS-485 device signaling (OSDP reader for example) and also provides tri-state LED
control, and buzzer control (one wire LED mode only). Four Form-C relay outputs may be used for door
strike control or alarm signaling. Eight inputs are provided that may be used for monitoring the door
contacts, exit push buttons and alarm contacts. Input circuits may be configured as unsupervised or
supervised. The LP1502 requires 12 to 24 Vdc for power.
2. LP1502 Hardware:
BATTERY: BR/CR2330 S2: RESET
REPLACE ANNUALLY SWITCH Ø.156 [3.96]
8 PLACES

3V BR/CR2330

.50 [12.70] 1 VIN

RESET

GND
STATUS 2

LEDs 3
TMP
S2

4
GND
BT1

5
FLT
R1
J2: ETHERNET
GND
R2 JACK
TB1

J2
S1 : DIP SWITCHES 2.00 [50.80]
EARTH
GROUND

J6: Micro USB

S1

D16
1
2
JACK
3
4

GND_C
J8: microSD
ON V
|
|

TB8 J6 CARD
8.00 [203.20] GND
VIN
READER 1

DAT
D0
CLK
J8

D1
J5

LED
3.00 [76.20]
VO TB3
TR+
TB9
GND TR-
VIN GND
READER 2

DAT TB4
D0
CLK IN1
D1
LED
IN2 J5: RS-485
VO
PASS 12V
TERMINATOR
NO
J7

IN3
OUT 1 C
NC
IN4 INPUT
NO
TB5
STATUS
2.00 [50.80]
OUT 2 C TB6
LEDs
TB10

IN5
NC
TB11

NO IN6
OUT 3 C
K
1 TB7
NC
K IN7
NO 2
J7: READER OUT 4 C
K
3
IN8
POWER .50 [12.70] NC
K
4
SELECT

.25 [6.35] 5.50 [139.70] RELAY

STATUS
6.00 [152.40] LEDs

LP1502 Layout
Mercury Security © 2018 LP1502 DOC 10107-0062 REV 1.01 Page 1
3. LP1502 Wiring and Setup:
CONNECTION CONNECTION
TB1-1 Power Fault GND TB8-1 Reader 1 GND: Ground
TB1-2 TB8-2 DAT/D0: Data/Data 0/TR- (A)
Input FLT
See note 1
TB1-3 TB8-3 CLK/D1: Clock/Data 1/TR+ (B)
Cabinet GND
See note 1
TB1-4 Tamper Input TMP TB8-4 BZR: Reader Buzzer
TB1-5 Power Input GND TB8-5 LED: Reader LED
TB1-6 VIN: 12 to 24 Vdc TB8-6 VO: Reader Power
TB2 N/A Not Used TB9-1 Reader 2 GND: Ground
TB9-2 DAT/D0: Data/Data 0/TR- (A)
TB3-1 GND
See note 1
SIO Port
TB9-3 CLK/D1: Clock/Data 1/TR+ (B)
TB3-2 (2-wire RS-485) TR- (B) See note 1
See note 1
TB3-3 TR+ (A) See note 1 TB9-4 BZR: Reader Buzzer
TB4-1 Input 2 IN2 TB9-5 LED: Reader LED
TB4-2 IN2 TB9-6 VO: Reader Power
TB4-3 Input 1 IN1 TB10-1 Out 1 NO: Normally Open Contact
TB4-4 IN1 TB10-2 C: Common
TB5-1 Input 4 IN4 TB10-3 NC: Normally Closed Contact
TB5-2 IN4 TB10-4 Out 2 NO: Normally Open Contact
TB5-3 Input 3 IN3 TB10-5 C: Common
TB5-4 IN3 TB10-6 NC: Normally Closed Contact
TB6-1 Input 6 IN6 TB11-1 Out 3 NO: Normally Open Contact
TB6-2 IN6 TB11-2 C: Common
TB6-3 Input 5 IN5 TB11-3 NC: Normally Closed Contact
TB6-4 IN5 TB11-4 Out 4 NO: Normally Open Contact
TB7-1 Input 8 IN8 TB11-5 C: Common
TB7-2 IN8 TB11-6 NC: Normally Closed Contact
TB7-3 Input 7 IN7
TB7-4 IN7
Note 1: Terms A & B are from the RS-485 standard
Jumpers and Jacks:
The LP1502 processor hardware interface is configured using jumpers to setup the reader port power and
end of line termination.
JUMPERS SET AT DESCRIPTION
J1 N/A Factory Use Only
J2 N/A 10-Base-T/100Base-Tx Ethernet Connection (Port 0)
J3 N/A Factory Use Only
J4 N/A N/A
J5 OFF RS-485 EOL Terminator is Off
ON RS-485 EOL Terminator is On
J6 N/A Micro USB Port (2.0)
J7 Reader Power Select. See Note 2
12V 12 Vdc at Reader Ports
PASS VIN "Pass Through" to Reader Ports
J8 N/A microSD Card
Note 2:
Install jumper J7 in the 12V position ONLY if the input voltage (VIN) is greater than 20 Vdc!
Failure to do so may damage the reader or LP1502!

Mercury Security © 2018 LP1502 DOC 10107-0062 REV 1.01 Page 2

 DIP Switches:
The four switches on S1 DIP switch configure the operating mode of the LP1502 processor. DIP switches
are read on power-up except where noted. Pressing reset switch S2 causes the LP1502 to reboot.
1 2 3 4 Definitions
OFF OFF OFF OFF Normal operating mode.
After initialization, enable default User Name (admin) and Password
ON X OFF OFF (password). The switch is read on the fly, no need to re-boot.
See IT Security section for additional information.
OFF ON OFF OFF Use factory default communication parameters.
ON ON OFF OFF Use OEM default communication parameters. Contact system
manufacture for details. See Bulk Erase below.
ON ON OFF OFF Bulk Erase prompt mode at power up. See Bulk Erase below.
Makes the LP1502 report and function like an EP1502. To be used in
X X X ON situations where the host software has not been updated to support
the LP series product line.
All other switch settings for unassigned and are reserved for future use. X = don’t care.
In the factory or OEM default modes, downloaded configuration/database is not saved to flash memory.
Factory Default Communication Parameters:
Interface 1 (NIC1)
Network: static IP address: 192.168.0.251
Subnet Mask: 255.255.0.0
Default Gateway: 192.168.0.1
DNS Server: 192.168.0.1
Primary Host port: IP server, Data Security: TLS if Available, port 3001, communication address: 0
Alternate Host Port: Disabled
4. Bulk Erase Configuration Memory:
The bulk erase function can be used for the following purposes:
 Erase all configuration and cardholder database (sanitize board, less third party applications)
 Update OEM default parameters after OEM code has been changed
 Recover from database corruption causing LP1502 board to continuously reboot
If clearing the memory does not correct the initialization problem, contact technical support.
Bulk Erase Steps: Do not remove power during steps 1-8.
1. Set S1 DIP switches to: 1 & 2 "ON", 3 & 4 "OFF".
2. Apply power to the LP1502 board. LED 1 on for about 15 seconds while LP1502 boots up.
3. After the LP1502 boots up, watch for LEDs 1 & 2 and 3 & 4 to alternately flash at a 0.5 second rate.
4. Within 10 seconds after the above pattern starts, change switches 1 or 2 to "OFF". If these switches
are not changed, the LP1502 board will power up using the OEM default communication parameters.
5. LED 2 will flash indicating that the configuration memory is being erased.
6. Full memory erase takes up to 60 seconds, usually a lot less.
7. When complete, only LEDs 1 & 4 will flash for about 3 seconds.
8. The LP1502 board will complete its initialization in 2 seconds after LEDs 1 & 4 stop flashing.
5. Input Power, Cabinet Tamper and UPS Fault Input Wiring:
The LP1502 requires 12 to 24 Vdc power. Locate power source as close to
TB1
the unit as possible. Connect power with minimum of 18 AWG wire.
VIN +12 TO 24 Vdc
-
Connect the GND signal to earth ground in ONE LOCATION within the
GND

system! Multiple earth ground connections may cause ground loop

TMP CABINET
problems and is not advised.
GND TAMPER
Observe POLARITY on 12 to 24 Vdc input!
FLT POWER
There are two dedicated inputs for cabinet tamper and UPS fault monitoring. GND FAULT
Normal (safe) condition is a closed contact. If these inputs are not used,
install a jumper wire.
Mercury Security © 2018 LP1502 DOC 10107-0062 REV 1.01 Page 3
6. Communication Wiring:
The LP1502 controller communicates to the host via the on-board Ethernet 10-BaseT/100Base-TX port
and/or the USB port (2.0) with an optional USB to Ethernet adapter.
The serial I/O device communication port (TB3) is a 2-wire RS-485 interface which can be used to connect
additional I/O panels. The interface allows multi-drop communication on a single bus of up to 4,000 feet
(1,219 m). Use 1-twisted pair with drain wire and shield, 120 ohm impedance, 24 AWG, 4,000 ft. (1,219
m) maximum for communication.

TB3
TR+
TR-
GND
1

To serial I/O Devices

IMPORTANT NOTE! Install the termination jumper ONLY on the panel at each end of the RS-485
bus. Failure to do so will compromise the proper operation of the communication channel!
7. Reader Wiring:
Each reader port supports a reader with TTL (D1/D0, Clock/Data), F/2F (standard or supervised) or 2-wire
RS-485 signaling (OSDP reader for example). Power to the readers is selectable: 12 Vdc (VIN must be
greater than 20 Vdc), or power is passed-through (PASS) from the input voltage of the LP1502 (TB1-VIN),
300 mA maximum per reader port. Readers that require different voltage or have high current requirements
must be powered separately. Refer to the reader manufacture specifications for cabling requirements. In
the 2-wire LED mode the buzzer output is used to drive the second LED. Reader port configuration is set
via the host software.
To fully utilize each reader port:
 TTL signaling requires a 6-conductor cable (18 AWG)
 F/2F signaling requires a 4-conductor cable
 RS-485 signaling requires two 2-conductor cables. Use one cable for power (18 AWG) and one
cable for communication (24 AWG, with drain wire and shield)

J7 – Reader Power Select

If the input voltage to the LP1502 is 12 Vdc, jumper J7 MUST be in the PASS position.

Typical D1/D0 or Clock/Data Reader Typical 2-wire RS-485 Device

(OSDP Reader for Example)
Mercury Security © 2018 LP1502 DOC 10107-0062 REV 1.01 Page 4
 * Inputs on supervised F/2F readers may be unsupervised or supervised (supervised shown).
TB8 or TB9
+12 Vdc
VO
TB8 or TB9 LED
+12 Vdc DO (GREEN LED)
VO BZR
D1
LED D1/CLK/TR+
DO (GREEN LED)
BZR D0/DAT/TR-
D1 GROUND
D1/CLK/TR+ GND
D0/DAT/TR- 1
1K,1%
GROUND
GND
1 1K,1%
DOOR MONITOR SWITCH
NORMALLY CLOSED CONTACT * 1K,1%

1K,1%

REQUEST TO EXIT SWITCH

NORMALLY OPEN CONTACT *

Typical Unsupervised F/2F Reader Typical Supervised F/2F Reader

Jumper D1 to LED on supervised F/2F readers

8. Input Circuit Wiring:

There are 8 inputs that are typically used to monitor door position, request to exit, or alarm contacts. Input
circuits can be configured as unsupervised or supervised. When unsupervised, reporting consists of only
the open or closed states. When configured as supervised, the input circuit will report not only open and
closed, but also open circuit, shorted, grounded*, and foreign voltage*. A supervised input circuit requires
two resistors be added to the circuit to facilitate proper reporting. The standard supervised circuit requires
1k ohm, 1% resistors and should be located as close to the sensor as possible. Custom end of line (EOL)
resistances may be configured via the host software.
* Grounded and foreign voltage states are not a requirement of UL 294 and therefore not verified by UL
The input circuit wiring configurations shown are supported but may not be typical:

Terminal Blocks
TB4 through TB7
IN4

Standard Supervised Circuit, 1K,1%

Normally Closed Contact 1K,1%
IN3

Standard Supervised Circuit, 1K,1%

Normally Open Contact
IN2 IN1

1K,1%

Unsupervised Circuit,
Normally Closed Contact

Unsupervised Circuit,
Normally Open Contact

Mercury Security © 2018 LP1502 DOC 10107-0062 REV 1.01 Page 5

9. Relay Circuit Wiring:
Four relays with Form-C contacts (dry) are provided for controlling door lock mechanisms or alarm signaling.
Each relay has a Common pole (C), a Normally Open pole (NO) and a Normally Closed pole (NC). When
controlling the delivery of power to the door strike, the Normally Open and Common poles are typically
used. When momentarily removing power to unlock the door, as with a mag lock, the Normally Closed and
Common poles are typically used. Check with local building codes for proper egress door installation.
Door lock mechanisms can generate feedback to the relay circuit that can cause damage and premature
failure of the relay plus affect the operation of the LP1502. For this reason, it is recommended that a diode
be used to protect the relay. Wire should be of sufficient gauge to avoid voltage loss.

Diode Selection:

Diode current rating: 1x strike current

Diode breakdown voltage: 4x strike voltage
For 12 Vdc or 24 Vdc strike, diode 1N4002
(100V/1A) typical.

10. Memory and Real Time Clock Backup Battery:

The static RAM and the real time clock are backed up by a lithium battery when input power is removed.
This battery should be replaced annually. If data in the static RAM is determined to be corrupt after power
up, all data, including flash memory, is considered invalid and is erased All configuration data must be re-
downloaded. Remove the insulator from the battery holder after installation. Battery type: BR2330 or
CR2330.
11. IT Security
When installing the LP1502, it is important to ensure that it is done in a secure manner.
Upon installation, the user accounts to the web configuration page should be created with secure
passwords, and that all DIP switches are in the off position for the normal operating mode. The LP1502
is shipped from the factory with a default login account, which is enabled when DIP 1 is moved from OFF
to ON. The default login user name and password will be available for five minutes once enabled.
Therefore, it is important that at least one user account is defined, and the DIP switches are set to OFF
before the LP1502 is commissioned. It is also highly recommended not to configure the LP1502 with an
IP address that is accessible from the public Internet.
To further enhance network security, options are available to disable SNMP, Zeroconf discovery, as well
as the web configuration module itself. Additionally, data encryption can also be enabled over the host
communication port.
12. Status LEDs:
Power-up: All LED's OFF.
Initialization: After power is applied or reset switch pushed, LED 1 is ON for about 15 seconds, then
LED’s 2, 3, 4, 5, 6, R1, R2, IN1, IN2, IN3, IN4, IN5, IN6, IN7 and IN8 are flashed once at the beginning of
initialization. LEDs 3 and 4 is turned ON for approximately 1 second after the hardware initialization has
completed, then the application code is initialized. The amount of time the application takes to initialize
depends on the size of the database, about 1 second without a card database. Each 10,000 cards will
add about 2 seconds to the application initialization. When LED's 1, 2, 3 and 4 flash at the same time,
data is being read from or written to flash memory, do not cycle power when in this state. If the sequence
stops or repeats, perform the bulk erase procedure, see section 4.

Mercury Security © 2018 LP1502 DOC 10107-0062 REV 1.01 Page 6

 Running: After initialization is complete, the LEDs have the following meanings:
LED DESCRIPTION
1 Off-Line / On-Line and Battery Status
Off-Line = 20% ON, On-Line = 80% ON
Double Flash if Battery is Low
2 Host Communication Activity (Ethernet or Micro USB port)
3 Internal SIO Communication Activity
4 External SIO Communication Activity
5 Unassigned
R1 Reader 1:
Clock/Data or D1/D0 Mode: Flashes when Data is Received, Either Input
F/2F Mode: Flashes when Data/Acknowledgment is Received
RS-485 Mode: Flashes when Transmitting Data
R2 Reader 2:
Clock/Data or D1/D0 Mode: Flashes when Data is Received, Either Input
F/2F Mode: Flashes when Data/Acknowledgment is Received
RS-485 Mode = Flashes when Transmitting Data
D16 Flashes with Ethernet Traffic
YEL Ethernet Speed: OFF = 10Mb/S, ON = 100Mb/S
GRN OFF = No Link, ON = Good Link, Flashing = Ethernet Activity
IN1 Input IN1 Status: OFF = Inactive, ON = Active, Flash = Fault. See Note 3.
IN2 Input IN2 Status: OFF = Inactive, ON = Active, Flash = Fault. See Note 3.
IN3 Input IN3 Status: OFF = Inactive, ON = Active, Flash = Fault. See Note 3.
IN4 Input IN4 Status: OFF = Inactive, ON = Active, Flash = Fault. See Note 3.
IN5 Input IN5 Status: OFF = Inactive, ON = Active, Flash = Fault. See Note 3.
IN6 Input IN6 Status: OFF = Inactive, ON = Active, Flash = Fault. See Note 3.
IN7 Input IN7 Status: OFF = Inactive, ON = Active, Flash = Fault. See Note 3.
IN8 Input IN8 Status: OFF = Inactive, ON = Active, Flash = Fault. See Note 3.
K1 Relay K1: ON = Energized
K2 Relay K2: ON = Energized
K3 Relay K3: ON = Energized
K4 Relay K4: ON = Energized
Note 3: If this input is defined, every three seconds the LED is pulsed to its opposite state for 0.1
seconds, otherwise, the LED is off.

13. Specifications:
The interface is for use in low voltage, Class 2 Circuits only.
The installation of this device must comply with all local fire and electrical codes.
Primary Power: 12 to 24 Vdc ± 10 %, 500 mA maximum (reader and USB ports not included)
Reader Ports: 600 mA maximum (add 600 mA to primary power current)
Micro USB Port: 5 Vdc, 500 mA maximum (add 270 mA to primary power current)
Memory and Clock
Backup Battery: 3 Volt Lithium, type BR2330 or CR2330
microSD Card: Format: microSD or microSDHC; 2GB to 8GB
Host Communication: Ethernet: 10-BaseT/100Base-TX and Micro USB port (2.0) with optional
adapter: pluggable model USB2-OTGE100
Serial I/O Device: One each: 2-wire RS-485, 2,400 to 115,200 bps, asynchronous, half-duplex,
1 start bit, 8 data bits, and 1 stop bit
Mercury Security © 2018 LP1502 DOC 10107-0062 REV 1.01 Page 7
 Inputs: Eight unsupervised/supervised, standard EOL: 1k/1k ohm, 1%, ¼ watt
Two unsupervised dedicated for cabinet tamper and UPS fault monitoring
Outputs: Four relays, Form-C with dry contacts
Normally open contact (NO) contact: 5 A @ 30 Vdc resistive
Normally closed contact (NC) contact: 3 A @ 30 Vdc resistive
Reader Interface:
Power: 12 Vdc ± 10 % regulated, 300 mA maximum each reader
(jumper selectable) (input voltage (VIN) must be greater than 20 Vdc)
or
12 to 24 Vdc ± 10 % (input voltage (VIN) passed through), 300 mA maximum
each reader
Data Inputs: TTL compatible, F/2F or 2-wire RS-485
RS-485 Mode: 9,600 to 115,200 bps, asynchronous, half-duplex, 1 start bit, 8 data bits, and
1 stop bit. Maximum cable length: 2000 ft. (609.6 m)
LED Output: TTL levels, high>3 V, low<0.5 V, 5 mA source/sink maximum
Buzzer Output: Open collector, 12 Vdc open circuit maximum, 40 mA sink maximum
Cable requirements:
Power and Relays: 1 twisted pair, 18 to 16 AWG
Ethernet: CAT-5, minimum
RS-485:
(I/O Device Port): 1 twisted pair, shielded, 120 ohm impedance, 24 AWG, 4,000 ft. (1,219 m)
max.
(Reader Port): 1 twisted pair, shielded, 120 ohm impedance, 24 AWG, 2,000 ft. (610 m)
max.
Alarm Input: 1 twisted pair, 30 ohms maximum
Environmental:
Temperature: -55 to +85 °C, storage
0 to +70 °C, operating
Humidity: 5 to 95 % RHNC
Mechanical:
Dimension: 8 in. (203.2 mm) W x 6 in. (152.4 mm) L x 1 in. (25 mm) H
Weight: 9 oz. (255 g) nominal, board only
UL294, 6th edition Performance Levels:
Feature Level
Standby Power I
Endurance IV
Line Security I
Destructive Attack I

These specifications are subject to change without notice.

Mercury Security © 2018 LP1502 DOC 10107-0062 REV 1.01 Page 8

Warranty

Mercury Security warrants the product is free from defects in material and workmanship under normal use
and service with proper maintenance for one year from the date of factory shipment. Mercury Security
assumes no responsibility for products damaged by improper handling or installation. This warranty is
limited to the repair or replacement of the defective unit.
There are no expressed warranties other than set forth herein. Mercury Security does not make, nor
intends, nor does it authorize any agent or representative to make any other warranties, or implied
warranties, and expressly excludes and disclaims all implied warranties of merchantability or fitness for a
particular purpose.
Returns must be accompanied by a Return Material Authorization (RMA) number obtained from customer
service, and prepaid postage and insurance.
Liability
The Interface should only be used to control exits from areas where an alternative method for exit is
available. This product is not intended for, nor is rated for operation in life-critical control applications.
Mercury Security is not liable under any circumstances for loss or damage caused by or partially caused
by the misapplication or malfunction of the product. Mercury Security’s liability does not extend beyond the
purchase price of the product.

Mercury Security © 2018 LP1502 DOC 10107-0062 REV 1.01 Page 9